arne anka, 2009-05-17 17:49:32 +0200 : >> So I'm wondering how to get the next SD card to last longer. Should I >> just get rid of the journaling and switch to ext2? > > additional wear because of journal is not significant.
Good to know. >> Should I stick to >> something specialised such as jffs2? > > jffs2 is a flash fs, not suited for e g sd cards. I thought SD cards were using flash memory internally. Wikipedia mentions "NAND flash", is it something different? >> How about BtrFS, is it usable yet? LogFS? > > btrfs does not seem to be usable for general purpose yet and logfs is > aimed at flash like jffs2. Hm. Okay. >> I'm also wondering whether it's really a good idea to put swap >> on a flash device, whatever the filesystem. > > if swap, then on sd card -- the flash is subject limited > writeoperations as well, but since built-in you can't change it like > an sd card. so, if generally wear is an issue for you, it applies to > flash as well. I don't know if the issue comes from wear, but I prefer wearing out a 10 € SD card than a 300 € Freerunner :-) >> Any comments would be welcome :-) > > i installed debian into both flash and sd card partition. > one partition on sd card serves as swap. > i had issues with sd card months ago including i/o errors and data > loss (most notably /var/lib/dpkg/status), but after some > reorganization and updates it went away and never came back. Ah. You wouldn't remember what kind of reorganisations, would you? > every newer sd card should have an iternal wear levelling and error > correction that should survive several years, so your issues are most > likely not caused by the sd card itself, but rather by the kernel resp > the glamo. I went from xserver-xglamo to xserver-xorg-video-glamo recently. Could it be linked? > with certain sd card sizes a kernel parameter was required either at > boot or via sysfs, but i am not quite sure inhowfar that still > applies. Hm. This is a 4 GB Sandisk micro-SDHC card. > - are you using u-boot or qi? u-boot 1.3.2-moko12. > - what kernel are you using? I'm using packaged linux-image-2.6.29-openmoko-gta02, version 20090303.gitb9de904e-2. > - error messages? dmesg currently loops on the following chunk (no X comes up, and the screen is blanked and redisplayed from time to time, ending in the usual "$hostname login:" [21474648.160000] fbcon_event_notify action=1, data=c7b97dc8 [21474653.700000] fbcon_event_notify action=12, data=c7b97da4 [21474653.700000] jbt6k74 spi2.0: **** jbt6k74 unblank [21474653.725000] fbcon_event_notify action=9, data=c7b97de0 [21474653.725000] jbt6k74 spi2.0: **** jbt6k74 unblank (The timestamps started back at ~60 after a while, for some reason) I also got this twice: [ 153.580000] glamo-mci glamo-mci.0: command timeout, continuing Then I tried a dist-upgrade, but it must have been lucky and not touched the wrong nerve. So I decided to cause some more write activity, and I ran "aptitude reinstall" on all installed packages (by chunks), to hopefully fix corrupted files that happened before. I got some aptitude internal errors, and I eventually got tired. I'm currently doing a backup of the micro-SD card under OM2007.2 by running "ssh mokomir tar cvf - /media/mmcblk0p2 > root.tar" from the computer. So far I got a few chunks of the following: mmc0: starting CMD18 arg 0070cd10 flags 000000b5 mmc0: blksz 512 blocks 32 flags 00000200 tsac 100 ms nsac 0 mmc0: CMD12 arg 00000000 flags 0000049d mmc0: req done (CMD18): 0: 00000900 00003f92 00000000 00000000 mmc0: 16384 bytes transferred: 0 mmc0: (CMD12): 0: 00000000 00000000 00000000 00000000 I'll try to restore the backup to a new card and re-run the aptitude stuff. > - log files? No syslog or klogd installed, sorry. Note for self: removing the has_journal attribute from the ext3 FS is not a good idea, as it turns the system unable to boot either 2.6.29, 2.6.28 or 2.6.24, they all panic with "No filesystem could mount root, tried: ext3". And there's no tune2fs in OM2007.2. Fortunately, the one installed on the SD card eventually managed to work (after several tries). Roland. -- Roland Mas One... two... one, two, many, lots! -- Lias, in Soul music (Terry Pratchett) _______________________________________________ Smartphones-userland mailing list Smartphones-userland@linuxtogo.org http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/smartphones-userland
